138500837 has 4 divisors (see below), whose sum is σ = 139015980. Its totient is φ = 137985696.

The previous prime is 138500833. The next prime is 138500863. The reversal of 138500837 is 738005831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 738005831 = 233 ⋅3167407.

It can be written as a sum of positive squares in 2 ways, for example, as 81739681 + 56761156 = 9041^2 + 7534^2 .

It is a cyclic number.

It is not a de Polignac number, because 138500837 - 2² = 138500833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138500797 and 138500806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138500833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257168 + ... + 257705.

It is an arithmetic number, because the mean of its divisors is an integer number (34753995).

Almost surely, 2^138500837 is an apocalyptic number.

It is an amenable number.

138500837 is a deficient number, since it is larger than the sum of its proper divisors (515143).

138500837 is an equidigital number, since it uses as much as digits as its factorization.

138500837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515142.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 138500837 is about 11768.6378566086. The cubic root of 138500837 is about 517.3893274655.

The spelling of 138500837 in words is "one hundred thirty-eight million, five hundred thousand, eight hundred thirty-seven".